Talking-machine



W S. SAMUEL.

TALKING MACHINE.

APPLICATION man Ams, 192|.

Patented Nov. 1, 1921.

2 SHEETS-SHEET l.

w. s. SAMUEL. TALKING MACHINE.

APPLICATION FILED APB. 5. I921 Patented Nov. 1, 1921.

2 SHEETSMSHEET 2.

UNITED STATES PATENT oFFvlcE.

WILFRED SAMPSON SAMUEL, OF LONDON, ENGLAND, ASSIGNOR TO BARNETT SAMUEL SONS, LIMITED, OF LONDON, ENGLAND, A CORPORATION OF GREAT BRITAIN.

TALKING-MACHINE.

To all wlwm t may concern:

Be it known that I, WILFRED SAMPsoN SAMUEL, a subject of the King of Great Britain and Ireland, residing at London, England, have invented' certain new and useful Improvements in Talking-Machines, of which the following is a specification.

This invention relates to improvements in talking machines of the type having a deflector toward which the sound waves from the tone arm are directed by an amplifier to which the tone arm is pivoted in such a way as to permit of universal relative movement when the tone arm is lowered for use, and to ermit of the tone arm being raised or fol ed back into close relation to the amplifier within the defiector when out of use.

In British specification No. 3033 of 1914, a thumb screw is suggested as a means for locking the tone arm in the raised position.`

This arrangement obviates the necessity .for the detachment of the tone arm and to a considerable degree avoids the ingress of dust, but as the thumb screw necessitates a slot in the sleeve joint between the tone arm and amplifier, there is still a liability for a certain amount of dust finding an entry through the slot. Dust entering at the joint is liable to affect the reproducer and it is highly desirable to exclude dust at these parts. Moreover even when the tone arm is locked in the raised position it is possible for it to swing about the vertical axis of the amplifier which leads to damage of the reproducer when the reflector lid is closed down while the tone arm is so displaced.

This has to some extent been mitigated in practice by the provision of a spring catchwhich, however, owing to the necessity for it to yield readily when the tone arm had to be lowered, was so resilient as to yield to rough handling of the gramophone casing, and the tone arm and reproducer were still liable to fall or project forward sufficiently to be damaged on closure of the lid of the casing.

The above disadvantages are avoided by the present invention, according to which the clamp for the sleeve joint between the tone arm and amplifier is devoid of any openings permitting ingress of dust. It is of such form that it is easier to manipulate, giving greater leverage than the clamping nut hitherto used and also being neater in appearance. Means are also provided by Specification of Letters Patent.

Patented Nov. 1, 1921. 1921. serial No. 4519.665. I

which the tone arm is positively held against a s wivellng motion relatively to the vertical axis of the amplifier when the arm is in the raised position or foldedback within the deflector.

One embodiment of the invention is i1lustrated in the accompanying drawings in which: Figurel is a perspective view of a talking machine of the type referred to showing the tone arm in its operative position.

F 1g. 2 is a cross sectional elevation of the universal joint between the tone arm and the amplifier. l

Figs. 3 and 4 are side elevations of the amplifier and tone arm, the tone arm being shown in its operative position in Fig. 3 and ralsed in Fig. 4, the arm being broken away to show the means for holding it in the vertical position.

Fig. 5 is a cross sectional elevation of a universal joint between the tone arm and the amplifier showing another form of attachment for the means for holding the tone arm in the vertical position. l

Fi 6 is a cross-sectional elevation on the line I-VI, Fig. 5.

Fig. 7 is an end view of the universal joint with the clamping means removed.

Fig. 8 is a perspective view of a modified -form of the means for holding the tone arm in the vertical position'.

Fig. 9 is a section on IX-IX, Fig. 5, as seen in the direction of the arm.

In the embodiment of the invention illustrated the tone arm 1 has afshort cylindrical extension 2, Fig. 2, which fits rotatably into the end of a horizontal sleeve 3. A cross bar 4 in the open end of the extension 2, carries a shaft rod 5 having a reduced end 6 which is screw threaded for a part of its length and passes through a hole formed in a plate 8, which closes the horizontal sleeve 3 near the end remote from the tone arm. A cap 9 having a milled edge, and provided with a shoulder 10 to fit the interior of the horizontal sleeve 3 is adapted to screw on to the screw threaded end 6 of the shaft 5, a screw 11 being provided on the end of the shaft 5 to prevent accidental removal of the disk 9.

The tone arm is provided with a resilient tongue 13 so that when the tone arm is raised or folded back into the defiector 14, Fig. l, the resilient tongue 13 passes between a flat bearin strip 15 secured to the side of the ampli er 21, and a flat spring 16, the spring being screwed to the bearing strip 15 by a screw 35 and the strip 15 being secured by screws 36 to the amplifier 2l as shown.in Figs. 2, 3, and 4. The tongue 13 is made in one with a ring 12 surrounding the extension' 3 of the tone arm l and having a lug 3() screwed to a lug 31 on the tone arm as shown in Figs. 2, 3, and 4 or it has an extension 32 passing through a slot in the extension 2 of the tone arm and secured to the end of the shaft 5, as shown in Figs. 5 and 6. The extension 32 of the tongue 13 is preferably situated behind the cross bar 4 in the open end of the tone arm extension 2 as shown in Figs. 5 and 6, so as to obstruct the passage as-little as possible. The leadin edge of the flat bearin strip l5 may be eveled so as to guide t e tongue 13 onto it, the tongue belng set to engage the surface w1th a certaln degree of friction, or if desired the leadlng edge of the tongue itself may be beveled. Moreover the spring `16 may be arranged to bear against the tongue 13. By suitably rotating the milled cap 9 after the tone arm has been raised the tongue 13 is still further drawn against the fiat bearin strip 15 so that the required degree of friction may be set up in order to prevent movement of the tone arm about a horizontal axis.

In the form shown in Fig. 8 a projection 33 on the spring 16 is provided to enter a slot 34 cut in the tongue 13 when the tone arm is in the vertical position. As shown in Fig. 8 the projection 33 is formed by pressing out the spring 16.

The horizontal sleeve 3 is provided with a short vertical tubular extension 17 which is surrounded at its upper end by a ring 18 having a cross bar 19 which carries a vertical pivot pin 20. The amplifier 21 is secured at its lower end to a ring 22 havingashoulder23. The ring 22 fits over the ring 18, the shoulder 23 resting on it. A vertical sleeve 25 is supported by a cross bar 24 carried by the ring 22, and is arranged so as to slide over the vertical pivot pin 20 when the amplifier is placedin position. Nuts 26 on the projecting, screwthreaded end of the pin 2O prevent removal of the amplifier'. It will be seen that the horizontal sleeve 3A can rotate about a vertical axis with relation to the amplifier 21, but is not normally removable therefrom, and that the tone arm 1 is universally jointed to the amplifier 21. A spiral spring 27, Figs. 2, 5 and 7 is anchored at one end to the reduced end 6 of the shaft 5, its other end being bent at right angles to enter one of a series of holes 28 in the plate 8, thus counteracting to some extent the weight of the tone arm and reproducer when they are in the operative position.

By removal of the milled cap 9 the spring 27 is rendered easily accessible, as shown in Fig. 7, thus enabling any unskilled person to remove, renew or adjust it, the last mentioned operation bein carried out by moving the end of the sprin 27 from one to another of the anchoring oles 28.

When the tone arm is raised, with the tongue 13 in engagement with the fiat bearing strip 15 on the amplifier, and the milled" cap 9 is rotated, it is firmly locked in this position and is not able to move about its horizontal or vertical axis, so that the lid of the gramophone casing may be lowered without fear of damaging the reproducer.

When the tone arm is to be lowered the milled cap 9 is slightly rotated in order to relieve the friction between the tongue 13 and the fiat surface 15.

A stop 29 on the cross bar 24 is arranged to come into contact with the cross bar 19 and thus limit the swiveling movement between the horizontal sleeve of the tone arm and the amplifier to facilitate correct positioning of the resilient tongue 13 with respect to the fiat surface 15.

I claim:

1. In a talking machine of the type referred to havin an amplifier, a tone arm and a universal joint between said tone arm and amplifier adapted to permit of swiveling movements of the tone arm about horizontal and vertical axes, means for preventing the tone arm swiveling about the vertical axis comprising a tongue on said tone arm and a fiat bearing strip on said amplifier, said tongue beingY adapted to engage with said bearing strip when said tone arm is in the inoperative position, and means for tightening the swivel connection between said tone arm and said amplifier for the y'purpose of increasing the pressure of said tongue on said bearing strip to prevent the tone arm swiveling about a horizontal axis.

2. In a talking machine of the type referred to havinganamplifier, a tone arm and a universal joint between said tone arm and amplifier adapted to permit of swiveling movements of the tone armabout horizontal and vertical axes, means for preventing the tone arm swiveling about the vertical axls when said tone arm is raised into its inoperative position, comprising a fiat bearing strip and a spring both carried by said amplifier and spaced apart, a tongue on said tone arm adapted to enter between said bearing strip and spring when said tone arm is raised and means for tightening the swivel connection between said tone arm and said amplifier for the purpose of increasing the pressure of said tongue on said bearing strip to prevent the tone arm swiveling about a horizontal axis.

3. -In a talking machine of the type referred to having an amplifier, a tone arm and a universal joint between said tone arm and amplifier adapted to permit of swiveling movements of the tone arm about horizontal and vertical axes, means for preventing the tone arm swiveling about the vertical axis when said tone arm is raised into its inoperative position, comprising a Hat bearing strip and a spring both carried by said amplifier and spaced apart, and a tongue on said tone arm adapted to enter between said bearing strip and spring when said tone arm is raised, said spring and said tongue having a projection and recess adapted to engage with one another when said tone arm is in its inoperative position and means for tightening the swivel connection between said tone arm and said amplifier for the purpose of increasing the pressure of said tongue on said bearing strip to prevent the tone arm swiveling about a horizontal aXis.

In testimony whereof I have signed my 20 name to this s ecication.

VVILFR D SAMPSON SAMUEL. 

